mxfdec: fix memleak on av_realloc failures

libavformat/mxfdec.c

@@ -407,16 +407,17 @@ static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, U
 static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
 {
     MXFContext *mxf = arg;
-    MXFPartition *partition;
+    MXFPartition *partition, *tmp_part;
     UID op;
     uint64_t footer_partition;
 
     if (mxf->partitions_count+1 >= UINT_MAX / sizeof(*mxf->partitions))
         return AVERROR(ENOMEM);
 
-    mxf->partitions = av_realloc(mxf->partitions, (mxf->partitions_count + 1) * sizeof(*mxf->partitions));
-    if (!mxf->partitions)
+    tmp_part = av_realloc(mxf->partitions, (mxf->partitions_count + 1) * sizeof(*mxf->partitions));
+    if (!tmp_part)
         return AVERROR(ENOMEM);
+    mxf->partitions = tmp_part;
 
     if (mxf->parsing_backward) {
         /* insert the new partition pack in the middle
@@ -512,11 +513,13 @@ static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size
 
 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
 {
+    MXFMetadataSet **tmp;
     if (mxf->metadata_sets_count+1 >= UINT_MAX / sizeof(*mxf->metadata_sets))
         return AVERROR(ENOMEM);
-    mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
-    if (!mxf->metadata_sets)
+    tmp = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
+    if (!tmp)
         return AVERROR(ENOMEM);
+    mxf->metadata_sets = tmp;
     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
     mxf->metadata_sets_count++;
     return 0;